Audio Authority Car Audio System - Manual (Page 7)

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Low Level Bus (Source Bus/Amp In Bus) Speaker Bus
Left Right
System Bus
HOW THE ACCESS ™ SYSTEM WORKS
When a product is selected for demonstration, signals are sent through a network of buses between switching
modules to activate that particular product position.
Selecting Products in the Access System
Products can be selected in a system in different ways that can all be combined into a single system, if desired.
You may select products in the following ways:
• By pressing a Product Select Button (PSB) connected to a switching module. This allows the user to build
different systems of product configurations manually.
• By using a control panel, if the system is so equipped. Control panel use is covered in detail in a separate
manual that accompanies each control panel.
• By issuing commands with the Model 905 IR Remote Control, which is included with the 902 Control
Panel and available with the 903. One 905 remote is recommended per salesperson.
• By using a computer touchscreen with AccessPC or custom software configured to enable product selec-
tions and other control functions.
• A combination of these methods.
Buses
Signals are passed between modules by “buses,” which are nothing more than cables that go from module to
module to module, connecting them into functional groups within the system’s architecture.
The System Bus connects all switching and system modules, allowing them to send messages to each other,
controlled by the addresses that are set by the installer. These signals instruct the modules to select the
inputs/outputs of a particular unit, such as a head unit or amplifier. Expander modules are not connected
directly to the System Bus. Each expander receives its instruction from the main switch module to which it is
attached.
Signal Buses carry audio signals, either low-level (source low-level output, for example) or high-level signals
(amplifier output).
Figure 3. Basic bus examples in a simple demonstration system.